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PZT(5/95)PZT(95/5) 이종층 박막의 코팅횟수에 따른 구조적 특성
노현지(Hyun-Ji Noh),이성갑(Sung-Gap Lee),남성필(Sung-Pill Nam),배선기(Sun-Gi Bae) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
The tetragonal PZT(5/95) and rhombohedral PZT(95/5) materials have ferroelectric and antiferroelectric characteristics, respectively. In this study, ferroelectric PZT(5/95)/antiferroelectric PZT(95/5) heterolayered thin films were fabricated by the sol-gel method, which were spin-coated onto the Pt/Ti/SiO₂/Si substrate alternately using PZT(5/95) and PZT(95/5) metal alkoxide solutions. We investigated the role of the lower PZT film in crystallization of the upper PZT film and the structural changes of the PZT film interfaces in heterolayered thin films. And structural and electrical properties were also investigated with variation of concentration of PZT coating solutions 0.1~0.7M. The PZT heterolayered thin films showed the typical XRD patterns of perovskite polycrystalline structure, and pyrochlore phase or rosette structures were not observed.
이동현(Dong-Hyun Lee),이승환(Seung-Hwan Lee),남성필(Sun-Pill Nam),이영희(Young-Hie Lee) 대한전기학회 2010 전기학회논문지 Vol.59 No.11
Electrical and structural properties were investigated on the effects of ZnO and the lead-free NKN-LST ceramics with the addition of ZnO were fabricated by a conventional mixed oxide method. A gradual change in the crystal and microstructure was observed with the increase of ZnO addition. For the NKN-LST-ZnO ceramics sintered at 1050℃, bulk density increased with the addition of ZnO and showed maximum value at addition 2.0mol% of ZnO. Curie temperature of the NKN-LST-ZnO ceramics slightly decreased with adding ZnO. The dielectric constant, piezoelectric constant (d₃₃) and electromechanical coupling factor (kp) increased at the small amount of ZnO addition, which might be due to the increase in density. The high piezoelectric properties = 153 pC/N, electromechanical coupling factor = 0.484 and dielectric constant = 2883 were obtained for the NKN-LST+0.5ZnO ceramics sintered at 1050℃ for 2h.